Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Reexamination Certificate
2011-08-09
2011-08-09
Mai, Lam T (Department: 2819)
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
C375S260000
Reexamination Certificate
active
07995973
ABSTRACT:
Circuits and methods are disclosed for reducing interference from transmitter leakage in a radio transceiver. An exemplary method for reducing interference from transmitter leakage in a radio transceiver comprises downconverting, filtering, and sampling a radio frequency signal comprising a desired signal and a transmitter leakage signal to obtain a sampled signal of interest. The method further comprises generating a sampled distortion signal estimate that estimates one or more distortion products of the transmitter leakage signal, such as a squared amplitude obtained from a square-law device or corresponding digital function. Further, the method comprises dividing the sampled distortion signal estimate and the sampled signal of interest into a plurality of frequency channels. Finally, for a selected number of frequency channels, the method comprises combining the sampled distortion signal estimate for a frequency channel with the corresponding sampled signal of interest for the same frequency channel to obtain interference-reduced signal samples for the frequency channel.
REFERENCES:
patent: 4888557 (1989-12-01), Puckette, IV et al.
patent: 5241702 (1993-08-01), Dent
patent: 5432522 (1995-07-01), Kurokami
patent: 5568520 (1996-10-01), Lindquist et al.
patent: 5712637 (1998-01-01), Lindquist et al.
patent: 5749051 (1998-05-01), Dent
patent: 6370205 (2002-04-01), Lindoff et al.
patent: 6449320 (2002-09-01), Lindoff
patent: 6473471 (2002-10-01), Lindquist et al.
patent: 6606484 (2003-08-01), Faulkner
patent: 6882868 (2005-04-01), Shattil
patent: 7046720 (2006-05-01), Lindoff et al.
patent: 7127211 (2006-10-01), Hildebrand et al.
patent: 7283799 (2007-10-01), Shattil
patent: 7477921 (2009-01-01), Shattil
patent: 7630688 (2009-12-01), Zeira
patent: 2004/0048576 (2004-03-01), Hildebrand et al.
patent: 2005/0159124 (2005-07-01), Shah
patent: 2007/0184782 (2007-08-01), Sahota et al.
patent: 2898746 (2007-09-01), None
Mattisson, S. et al. “Methods and Apparatus for Suppressing Strong-Signal Interference in Low-IF Receivers” Co-pending U.S. Appl. No. 12/147,962, filed Jun. 27, 2008.
Dent, P. W. et al. “Methods and Apparatus for Reducing Own-Transmitter Interference in Low-IF and Zero-IF Receivers.” Co-pending U.S. Appl. No. 12/163,248, filed Jun. 27, 2008.
Dent, P. W. et al. “Strong Signal Tolerant OFDM Receiver and Receiving Methods.” Co-pending U.S. Appl. No. 12/339,630, filed Dec. 19, 2008.
International Search Report for PCT Application No. PCT/EP2009/058054 mailed Feb. 24, 2010.
Dent Paul Wilkinson
Mattisson Sven
Coats & Bennett P.L.L.C.
Mai Lam T
Telefonaktiebolaget LM Ericsson (publ)
LandOfFree
Own transmitter interference tolerant transceiver and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Own transmitter interference tolerant transceiver and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Own transmitter interference tolerant transceiver and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2792772